Finally got round to converting my wipe scripts over to the GS4.
Kernel wipe is very basic (as I don't know of any GS4 kernel-specific files/folders as yet) but the rest are pretty much as per the GS2 (apart from ROM-specific file/folder removal)
All scripts are Beta, so expect a few niggles and bugs, and as always, I recommend a CWM backup beforehand.
And for Android Forum members only, I've combined all the latest scripts into a single zip.
This would of course require you copying the bundled zip onto your PC, unzip it (eg. use 7Zip), and copy the scripts you require to your GS4.
My latest GS4 Wipe Scripts bundle